added cache length setting

caplot.py

@@ -6,17 +6,19 @@ warnings.filterwarnings("error")
 
 import argparse
 
-parser = argparse.ArgumentParser()
+parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
 parser.add_argument("pvname")
+parser.add_argument("-n", "--num", type=int, default=1000)
 clargs = parser.parse_args()
 
 
+from functools import partial
 from animation import Animation
 from plots import Plot0D, Plot1D, Plot2D
 from sources import Camera, Source
 
 
-def decide_src_fun(pvname):
+def decide_src_fun(pvname, num):
     pvname = pvname.upper()
 
     if pvname.endswith(":FPICTURE"):
@@ -33,7 +35,9 @@ def decide_src_fun(pvname):
 
     if src.nelm == 1:
         print("Scalar")
-        fun = Plot0D
+        if num <= 0:
+            num = None
+        fun = partial(Plot0D, num)
     else:
         print("Curve")
         fun = Plot1D
@@ -43,7 +47,8 @@ def decide_src_fun(pvname):
 
 
 pvname = clargs.pvname
-src, fun = decide_src_fun(pvname)
+num = clargs.num
+src, fun = decide_src_fun(pvname, num)
 Animation(src, fun)